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Author Topic: Barix Impedances  (Read 777 times)
CityRadio91.9
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« on: July 03, 2009, 05:41:11 AM »

Can anyone tell me what the input and output impedances are for
the Barix Extreamer 110?
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RealityCheckr
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« Reply #1 on: July 03, 2009, 07:49:31 AM »

Why do you ask?

It is 99% likely it has low impedance outputs and high impedance inputs.
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Nostalgia
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« Reply #2 on: July 03, 2009, 09:22:07 AM »

Ethernet input, Stereo RCA jacks (meaning Hi-Z unbalanced), 3.5 mm Headphone Jack, both 4Vpp max (8Vpp in bridge output mode) outputs

Without sounding snarky (if that is a word) you could probably have Googled BARIX and got the complete spec sheet downloaded in the time it took you to post this question.  click here: http://www.barix.com/downloads/Exstreamer_Family/71/
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sonic
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« Reply #3 on: July 03, 2009, 06:12:33 PM »

Typical engineers....the man asks the Exstreamer impedance, one poster says low output, high input - of course doesn't give a specific impedance...i.e., he doesn't know and is guessing....the other shows you the link to the manual (which, btw doesn't note the impedance).....thus doesn't know either and is guessing.....

Yes, I'm an engineer and and engineering manager....these are the kind of responses that frustrate me from my team....

So the question is still valid - does anyone know the output impedance of the Exstreamer...I'd guess 10k unbalanced...but I'm guessing....and I can't find it in writing.....
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RealityCheckr
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« Reply #4 on: July 03, 2009, 08:41:16 PM »

I am not going to spend much time on it unless s/he can answer the question "why do you ask".

Typical engineers....the man asks the Exstreamer impedance, one poster says low output, high input - of course doesn't give a specific impedance...i.e., he doesn't know and is guessing....the other shows you the link to the manual (which, btw doesn't note the impedance).....thus doesn't know either and is guessing.....

Yes, I'm an engineer and and engineering manager....these are the kind of responses that frustrate me from my team....

So the question is still valid - does anyone know the output impedance of the Exstreamer...I'd guess 10k unbalanced...but I'm guessing....and I can't find it in writing.....
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sonic
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« Reply #5 on: July 03, 2009, 09:18:49 PM »

I'm pretty sure he's wanting to understand/identify any impedance mismatches in his audio chain. A valid concern.....he may need a matchbox - maybe not - depends on the what the Barix does.  But I'm pretty sure you don't know (you would've answered such a simple question already)...I think Barix will have to reveal this answer.
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RealityCheckr
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« Reply #6 on: July 03, 2009, 10:05:20 PM »

I greatly prefer mismatched impedances on analog audio interfaces since I am not concerned about power transfer.

As long as the inputs are higher impedance than the feeding equipment, and the outputs are lower than the impedence of the destination device, all is great.

Since this is true 99% of the time with modern equipment, I am quite curious why the OP is asking this question.

If the question is about levels, this has been answered.

I'm pretty sure he's wanting to understand/identify any impedance mismatches in his audio chain. A valid concern.....he may need a matchbox - maybe not - depends on the what the Barix does.  But I'm pretty sure you don't know (you would've answered such a simple question already)...I think Barix will have to reveal this answer.
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Goran Tomas
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« Reply #7 on: July 04, 2009, 04:47:36 AM »

The manufacturer who claims any sort of professionalism, should have clear specifications in their manual/data sheet. Input and output impedances and maximum levels, frequency response, distortion figures are just some bare minimums...


Regards,
Goran Tomas
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ChiefEngineer
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« Reply #8 on: July 04, 2009, 02:20:31 PM »

I went to the website. Can't find the information specifically.

I suggest info@barix.com and you will get a prompt reply.

I ahve been using these for quite some time.  If I say ten it may be more in the field.

The input is high impedance (exactly what I am not sure) but can be driven with a variety of products.  The output has either an RCA stereo jack or headphone type output. Normally this can drive 600 ohm equipment.

We use this to feed off site network stations on one of our state wide networks. The proof is done at the network station's site (mixer at the transmitter). I am not sure the mp3 version of the 100 or 110 (it has an lcd display but is no different in operation otherwise) will pass a proof.

Most engineers want the whole story not a part of it. If you don't want to tell why why should someone share knowledge about something and then find out they didn't have the whole story?

WITT is a new station with an eclectic mix of music.  Some audiophiles are griping about the music.

The station feeds audio from a computer (what type of audio and sample rate?) to an analog console (yes?)  hopefully to a limiter (what kind? - don't tell me no limiter because that's bad) prior to the barix instreamer or ogg vorbis encoder encoding mp3 on a computer.

 How the station interfaces the computer audio and it's files (and type of audio file) through the chain to the mp3 encoder and the the levels are very important.  Most computers do not have the input level variation you really want (to encode) and until you dink with it for a long time you will not get it right.

On the receive end you will have to use an interface from unbalanced (regardless of the impedance) to balanced to get the level hot enough to make this work into the audio processor.  Because of the artsy fartsy format the station is not using heavy compression but wants to be loud.  This is the problem.  Any compression will enlarge any audio problems from the encoding end. And your transmitter site is near 50 kw 1070 AM so any ground issues will be noted very evident. Radio SHack used to sell a transformer with rca connectors.  This is a start.  MAI parts has various filters for AM AND FM rf. Depending on your situation your rf could be an issue.

We have worked through  many of these issues which came down to good engineering practice. You have many issues fixed because Jeffe Goode did the install.

If you want to maintain audio purity without a real stl place your source material at the transmitter site and use the barix for feeds. Because of the delay you can't have the station in the headphones so it's a matter of delay and how much anyway.

And this is like any other audio chain.  Once it is working lock the controls to keep people from changing them. or things will go from good to bad quick.

Give us the whol scoop on the WITT audio chain so we can all guess at the particulars of the problem., and, GOOD LUCK.


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If you build it, it will eventually burn, and you can build it again.
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« Reply #9 on: July 04, 2009, 03:12:54 PM »

Typical engineers....the man asks the Exstreamer impedance, one poster says low output, high input - of course doesn't give a specific impedance...i.e., he doesn't know and is guessing....the other shows you the link to the manual (which, btw doesn't note the impedance).....thus doesn't know either and is guessing.....

First I did not find the earlier response to his question neither productive nor informative.  I told him what I KNEW and gave him the link to the manual which, as pointed out, does not actually state the impedances but is the most factual source of information available.  There is also the link to email barix should he still have questions.

But, in my many years of doing this, and prior to AES and its impedance, we really were faced with only two choices for line level devices.  Low, meaning 600 ohm balanced, and high which was >10k ohm and unbalanced.  Mostly referred to in catalogs as home and professional connections.  I did state that the output was RCA connectors (Hi-Z and unbalanced).  That info alone should be enough for him to look at what he wants to connect it to and decide if he needs a matchbox or not. 

For the Chief Engineer, with this thing at the TX site I am glad you are using a matchbox or something similar to get it to 600 ohm and balanced fairly quickly with all that RF running around plus I am sure that is what the remainder of your professional audio chain, if not just the transmitter input terminals, are looking for.  But did you really need to know the exact output impedance?  I didnt think so. You did bring up one point that I was wondering about with a customer wanting to use these as an STL.  With the compression inherent in the  MP3 coding I dont want to do a lot of processing at the automation end because we would be compressing compression.  How are people dealing with this?   This is for a small AM music format so we wont have audiophiles to p*** off  Grin
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